Chapter 10 lecture notes

O2 photon p680 h2o 2e e e p680 need to replenish

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: leaf: open system Chloroplast of a leaf Photosystem Photon Thylakoid Light ­Harves>ng Complex Stroma Reac>on Center Primary electron acceptor Thylakoid Membrane Transfer of Energy e ­ Stroma Thylakoid Space Specific pair of chlorophyll a molecules P680 or P700 Thylakoid Space Photosystem contains: 1. Reac0on center: Protein complex that contains special chlorophyll a molecules 2. Several light harves0ng complexes: Consists of various pigment molecules bound to proteins Primary Electron Acceptor Light ­Harves>ng Complex Chlorophyll a P680 or P700 redox reduction chlorophyll a, chlorophyll b, carotenoids Thylakoid Membrane has two types of photosystems: Photosystem II: Chlorophyll a absorbs light best at 680 nm: red part of spectrum Photosystem I: Chlorophyll a absorbs light best at 700 nm: far red part of the spectrum Mechanical Analogy for the light reacBon Linear electron flow during the light reacBon Photo System II Photo System II Primary acceptor 2e ­ Primary acceptor 2H+ + ½ O2 Photon P680+ H2O 2e ­ e ­ e ­ P680+ Need to replenish e ­ in P680+ Step 1 P680+ is the strongest oxidizing agent * readily accepts 2e- from H2O P680+ is reduced to P680. Step 2 O atom combines with another O atom generated from an...
View Full Document

This document was uploaded on 02/10/2014.

Ask a homework question - tutors are online